Exclude PrivacyInfo.xcprivacy resource on Android

Declaring a resource on the SQLite target makes SwiftPM generate a
Bundle.module accessor that unconditionally imports Foundation and
calls Bundle.main/Bundle(path:), which requires linking all of
Foundation (plus FoundationInternationalization and ICU on affected
SDKs) even for consumers that otherwise only need FoundationEssentials.

PrivacyInfo.xcprivacy only has meaning for the Apple App Store, so this
excludes it under a TARGET_OS_ANDROID environment variable, following
the same convention swift-android-native uses to detect an Android
cross-compile from Package.swift (which always evaluates on the host
and has no direct way to see the build destination). No effect on
existing consumers since the variable is unset by default.

Author: colemancda

Package.swift

@@ -2,6 +2,15 @@
 import PackageDescription
 let applePlatforms: [PackageDescription.Platform] = [.iOS, .macOS, .watchOS, .tvOS, .visionOS]
 
+// Package.swift always compiles for the host, so it can't see the build
+// destination directly — an environment variable (matching the convention
+// used by swift-android-native's own `TARGET_OS_ANDROID` check) is the only
+// way to detect an Android cross-compile here. `PrivacyInfo.xcprivacy` is
+// only meaningful for the Apple App Store; declaring it as a resource makes
+// SwiftPM generate a `Bundle.module` accessor that requires linking all of
+// Foundation on Android, so it's excluded there.
+let isAndroid = Context.environment["TARGET_OS_ANDROID"] ?? "0" != "0"
+
 let target: Target = .target(
     name: "SQLite",
     dependencies: [
@@ -12,8 +21,8 @@ let target: Target = .target(
                  package: "SQLCipher.swift",
                  condition: .when(platforms: applePlatforms, traits: ["SQLCipher"]))
     ],
-    exclude: ["Info.plist"],
-    resources: [.copy("PrivacyInfo.xcprivacy")],
+    exclude: isAndroid ? ["Info.plist", "PrivacyInfo.xcprivacy"] : ["Info.plist"],
+    resources: isAndroid ? [] : [.copy("PrivacyInfo.xcprivacy")],
     cSettings: [
         .define("SQLITE_HAS_CODEC", .when(platforms: applePlatforms, traits: ["SQLCipher"]))
     ]